I had a type 01 "Dealer in Firearms" license, not a C&R, but I did receive a visit.
This was back in 1994 when a guy drove up while I was outside in the frontyard of my house (I was one of those despicable "kitchen-table" gun dealers much maligned by Clinton). He flashed his badge and said "I'm with the ATF and I need to check your records."
He sat at my kitchen table and looked over all of my form 4473's and then asked to see copies of my licenses - City Business license, Retail Sales Permit, and FFL - and then said "The only reason I'm here is because Anaheim, California is considered a high crime area by the ATF and we are checking everybody's license in Anaheim". He was very polite!.
After he looked at my records, I asked him if he wanted to look at my inventory in my gun safe and he said "No", and then he left. This left me feeling a little put out because I had carefully labeled all of my personal firearms "Not For Sale", per ATF guidelines, and he didn't even care!.
It was a strange coincidence that when I got my FFL again about 9 years later in an adjacent city, this same guy shows up with a rookie agent to do my interview.
I never received a visit the second time I had my FFL (I had it for 3 years).